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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E36/7 Z3 (1996-2002)

E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 09-09-2010, 06:03 PM
Pete V Pete V is offline
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Location: Cornelius NC
 
Join Date: Sep 2009
Posts: 9
Mein Auto: 2011 Z4 35 is
Rear end swap 2007 Z4

Hi Folks
I have a couple of questions maybe someone can help answer.
I have a 2007 Z 4 3.0i auto and would like to know, what the stock rear end gear ratio is, and what the 2007 standard trans rear end ratio is,and if it would be an easy swap?
Does anyone have any experience with this type of change and do you think it would be worth it!
Thanks
Pete V
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  #2  
Old 09-09-2010, 08:54 PM
Incompatible Incompatible is offline
.........................
Location: San Diego
 
Join Date: Mar 2008
Posts: 182
Mein Auto: 2007 Z4 3.0Si Coupe
3.0Si model
M = 3.46:1
A = 3.64:1

3.0i
M = 3.38:1
A = 3.73:1

Ratios complements of Ron Stygar

Easy enough to do, but why? The difference in performance is questionable in respect to the cost. Maybe if you were going to a limited slip rear and were planning on a whole rear diff swap or you got a killer deal on the higher ratio complete diff. Many will tell you that the 3.9x is a better way to go.
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Last edited by Incompatible; 09-09-2010 at 09:08 PM.
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  #3  
Old 09-10-2010, 10:26 AM
Pete V Pete V is offline
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Location: Cornelius NC
 
Join Date: Sep 2009
Posts: 9
Mein Auto: 2011 Z4 35 is
Ron
Thank you for taking the time to help me out. I was thinking that maybe this swap would provide a little more spunk to my auto 3.0i.
Thanks again.
Pete v
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